System.Windows.Forms.ThemeWin32Classic.DrawMonthCalendarButton C# (CSharp) Method

		private void DrawMonthCalendarButton (Graphics dc, Rectangle rectangle, MonthCalendar mc, Size title_size, int x_offset, Size button_size, bool is_previous) 
		{
			const int arrow_width = 4;
			const int arrow_height = 7;

			bool is_clicked = false;
			Rectangle button_rect;
			PointF arrow_center;
			PointF [] arrow_path = new PointF [3];
			
			// prepare the button
			if (is_previous) 
			{
				is_clicked = mc.is_previous_clicked;

				button_rect = new Rectangle (
					rectangle.X + 1 + x_offset,
					rectangle.Y + 1 + ((title_size.Height - button_size.Height)/2),
					Math.Max(button_size.Width - 1, 0),
					Math.Max(button_size.Height - 1, 0));

				arrow_center = new PointF (button_rect.X + ((button_rect.Width + arrow_width) / 2.0f), 
											rectangle.Y + ((button_rect.Height + arrow_height) / 2) + 1);
				if (is_clicked) {
					arrow_center.X += 1;
					arrow_center.Y += 1;
				}

				arrow_path [0].X = arrow_center.X;
				arrow_path [0].Y = arrow_center.Y - arrow_height / 2.0f + 0.5f;
				arrow_path [1].X = arrow_center.X;
				arrow_path [1].Y = arrow_center.Y + arrow_height / 2.0f + 0.5f;
				arrow_path [2].X = arrow_center.X - arrow_width;
				arrow_path [2].Y = arrow_center.Y + 0.5f;
			}
			else
			{
				is_clicked = mc.is_next_clicked;

				button_rect = new Rectangle (
					rectangle.Right - 1 - x_offset - button_size.Width,
					rectangle.Y + 1 + ((title_size.Height - button_size.Height)/2),
					Math.Max(button_size.Width - 1, 0),
					Math.Max(button_size.Height - 1, 0));

				arrow_center = new PointF (button_rect.X + ((button_rect.Width + arrow_width) / 2.0f), 
											rectangle.Y + ((button_rect.Height + arrow_height) / 2) + 1);
				if (is_clicked) {
					arrow_center.X += 1;
					arrow_center.Y += 1;
				}

				arrow_path [0].X = arrow_center.X - arrow_width;
				arrow_path [0].Y = arrow_center.Y - arrow_height / 2.0f + 0.5f;
				arrow_path [1].X = arrow_center.X - arrow_width;
				arrow_path [1].Y = arrow_center.Y + arrow_height / 2.0f + 0.5f;
				arrow_path [2].X = arrow_center.X;
				arrow_path [2].Y = arrow_center.Y + 0.5f;
			}

			// fill the background
			dc.FillRectangle (SystemBrushes.Control, button_rect);
			// draw the border
			if (is_clicked) {
				dc.DrawRectangle (SystemPens.ControlDark, button_rect);
			}
			else {
				CPDrawBorder3D (dc, button_rect, Border3DStyle.Raised, Border3DSide.Left | Border3DSide.Right | Border3DSide.Top | Border3DSide.Bottom);
			}
			// draw the arrow
			dc.FillPolygon (SystemBrushes.ControlText, arrow_path);			
			//dc.FillPolygon (SystemBrushes.ControlText, arrow_path, FillMode.Winding);
		}